When you say black metal does that imply a Norwegian (or norse-derived) sound to you? There are quite a few other black metal scenes that are inherently more thrashy sounding than the frozen northerners did it. I would encourage you to look into Greek releases like His Majesty at the Swamp and Non Serviam. There's also Czech monsters like Master's Hammer and Root who are a lot more thrashy.

Sigh's Scorn Defeat. Well, it depends what you mean by thrash influences, always present or does depending on the song/moment works for you? If the later I definitely recommend this album, well, Sigh's early output is often considered as thrashy black metal. And if you're into some more experimental stuff, their sophomore Infidel Art has some quite thrashy passages.

Check out Infernal Stronghold. Their latest LP "Godless Noise" is sick black metal with slight thrash influences and the further back in their discography you go the more thrash influence you will find. Great band.